Follow-up Phase: In the event that disease has not progressed at the end-of-treatment visit, disease assessment scans will continue every 12 weeks (+ 2 weeks) until disease progression is documented. Patients will be contacted by phone every 6 months for survival status for the first two years following the completion of study treatment, then yearly thereafter, until death, withdrawal of informed consent or they become lost to follow-up, whichever occurs first. Patients will be monitored for two years, following the completion of study treatment, for the development of myelodysplasia and secondary leukemia.